package util;

import java.lang.reflect.Array;
import java.util.Arrays;

public abstract class ObjectUtils {
	private static final int INITIAL_HASH = 7;
	private static final int MULTIPLIER = 31;
	private static final String EMPTY_STRING = "";
	private static final String NULL_STRING = "null";
	private static final String ARRAY_START = "{";
	private static final String ARRAY_END = "}";
	private static final String EMPTY_ARRAY = "{}";
	private static final String ARRAY_ELEMENT_SEPARATOR = ", ";

	public static boolean isCheckedException(Throwable ex) {
		return ((!(ex instanceof RuntimeException)) && (!(ex instanceof Error)));
	}

	public static boolean isCompatibleWithThrowsClause(Throwable ex,
			Class[] declaredExceptions) {
		if (!(isCheckedException(ex))) {
			return true;
		}
		if (declaredExceptions != null) {
			int i = 0;
			while (i < declaredExceptions.length) {
				if (declaredExceptions[i].isAssignableFrom(ex.getClass())) {
					return true;
				}
				++i;
			}
		}
		return false;
	}

	public static boolean isArray(Object obj) {
		return ((obj != null) && (obj.getClass().isArray()));
	}

	public static boolean isEmpty(Object[] array) {
		return ((array == null) || (array.length == 0));
	}

	public static boolean containsElement(Object[] array, Object element) {
		if (array == null) {
			return false;
		}
		for (Object arrayEle : array) {
			if (nullSafeEquals(arrayEle, element)) {
				return true;
			}
		}
		return false;
	}

	public static Object[] addObjectToArray(Object[] array, Object obj) {
		Class compType = Object.class;
		if (array != null) {
			compType = array.getClass().getComponentType();
		} else if (obj != null) {
			compType = obj.getClass();
		}
		int newArrLength = (array != null) ? array.length + 1 : 1;
		Object[] newArr = (Object[]) Array.newInstance(compType, newArrLength);
		if (array != null) {
			System.arraycopy(array, 0, newArr, 0, array.length);
		}
		newArr[(newArr.length - 1)] = obj;
		return newArr;
	}

	public static Object[] toObjectArray(Object source) {
		if (source instanceof Object[]) {
			return ((Object[]) source);
		}
		if (source == null) {
			return new Object[0];
		}
		if (!(source.getClass().isArray())) {
			throw new IllegalArgumentException("Source is not an array: "
					+ source);
		}
		int length = Array.getLength(source);
		if (length == 0) {
			return new Object[0];
		}
		Class wrapperType = Array.get(source, 0).getClass();
		Object[] newArray = (Object[]) Array.newInstance(wrapperType, length);
		for (int i = 0; i < length; ++i) {
			newArray[i] = Array.get(source, i);
		}
		return newArray;
	}

	public static boolean nullSafeEquals(Object o1, Object o2) {
		if (o1 == o2) {
			return true;
		}
		if ((o1 == null) || (o2 == null)) {
			return false;
		}
		if (o1.equals(o2)) {
			return true;
		}
		if ((o1.getClass().isArray()) && (o2.getClass().isArray())) {
			if ((o1 instanceof Object[]) && (o2 instanceof Object[])) {
				return Arrays.equals((Object[]) o1, (Object[]) o2);
			}
			if ((o1 instanceof boolean[]) && (o2 instanceof boolean[])) {
				return Arrays.equals((boolean[]) o1, (boolean[]) o2);
			}
			if ((o1 instanceof byte[]) && (o2 instanceof byte[])) {
				return Arrays.equals((byte[]) o1, (byte[]) o2);
			}
			if ((o1 instanceof char[]) && (o2 instanceof char[])) {
				return Arrays.equals((char[]) o1, (char[]) o2);
			}
			if ((o1 instanceof double[]) && (o2 instanceof double[])) {
				return Arrays.equals((double[]) o1, (double[]) o2);
			}
			if ((o1 instanceof float[]) && (o2 instanceof float[])) {
				return Arrays.equals((float[]) o1, (float[]) o2);
			}
			if ((o1 instanceof int[]) && (o2 instanceof int[])) {
				return Arrays.equals((int[]) o1, (int[]) o2);
			}
			if ((o1 instanceof long[]) && (o2 instanceof long[])) {
				return Arrays.equals((long[]) o1, (long[]) o2);
			}
			if ((o1 instanceof short[]) && (o2 instanceof short[])) {
				return Arrays.equals((short[]) o1, (short[]) o2);
			}
		}
		return false;
	}

	public static int nullSafeHashCode(Object obj) {
		if (obj == null) {
			return 0;
		}
		if (obj.getClass().isArray()) {
			if (obj instanceof Object[]) {
				return nullSafeHashCode((Object[]) obj);
			}
			if (obj instanceof boolean[]) {
				return nullSafeHashCode((boolean[]) obj);
			}
			if (obj instanceof byte[]) {
				return nullSafeHashCode((byte[]) obj);
			}
			if (obj instanceof char[]) {
				return nullSafeHashCode((char[]) obj);
			}
			if (obj instanceof double[]) {
				return nullSafeHashCode((double[]) obj);
			}
			if (obj instanceof float[]) {
				return nullSafeHashCode((float[]) obj);
			}
			if (obj instanceof int[]) {
				return nullSafeHashCode((int[]) obj);
			}
			if (obj instanceof long[]) {
				return nullSafeHashCode((long[]) obj);
			}
			if (obj instanceof short[]) {
				return nullSafeHashCode((short[]) obj);
			}
		}
		return obj.hashCode();
	}

	public static int nullSafeHashCode(Object[] array) {
		if (array == null) {
			return 0;
		}
		int hash = 7;
		int arraySize = array.length;
		for (int i = 0; i < arraySize; ++i) {
			hash = 31 * hash + nullSafeHashCode(array[i]);
		}
		return hash;
	}

	public static int nullSafeHashCode(boolean[] array) {
		if (array == null) {
			return 0;
		}
		int hash = 7;
		int arraySize = array.length;
		for (int i = 0; i < arraySize; ++i) {
			hash = 31 * hash + hashCode(array[i]);
		}
		return hash;
	}

	public static int nullSafeHashCode(byte[] array) {
		if (array == null) {
			return 0;
		}
		int hash = 7;
		int arraySize = array.length;
		for (int i = 0; i < arraySize; ++i) {
			hash = 31 * hash + array[i];
		}
		return hash;
	}

	public static int nullSafeHashCode(char[] array) {
		if (array == null) {
			return 0;
		}
		int hash = 7;
		int arraySize = array.length;
		for (int i = 0; i < arraySize; ++i) {
			hash = 31 * hash + array[i];
		}
		return hash;
	}

	public static int nullSafeHashCode(double[] array) {
		if (array == null) {
			return 0;
		}
		int hash = 7;
		int arraySize = array.length;
		for (int i = 0; i < arraySize; ++i) {
			hash = 31 * hash + hashCode(array[i]);
		}
		return hash;
	}

	public static int nullSafeHashCode(float[] array) {
		if (array == null) {
			return 0;
		}
		int hash = 7;
		int arraySize = array.length;
		for (int i = 0; i < arraySize; ++i) {
			hash = 31 * hash + hashCode(array[i]);
		}
		return hash;
	}

	public static int nullSafeHashCode(int[] array) {
		if (array == null) {
			return 0;
		}
		int hash = 7;
		int arraySize = array.length;
		for (int i = 0; i < arraySize; ++i) {
			hash = 31 * hash + array[i];
		}
		return hash;
	}

	public static int nullSafeHashCode(long[] array) {
		if (array == null) {
			return 0;
		}
		int hash = 7;
		int arraySize = array.length;
		for (int i = 0; i < arraySize; ++i) {
			hash = 31 * hash + hashCode(array[i]);
		}
		return hash;
	}

	public static int nullSafeHashCode(short[] array) {
		if (array == null) {
			return 0;
		}
		int hash = 7;
		int arraySize = array.length;
		for (int i = 0; i < arraySize; ++i) {
			hash = 31 * hash + array[i];
		}
		return hash;
	}

	public static int hashCode(boolean bool) {
		return ((bool) ? 1231 : 1237);
	}

	public static int hashCode(double dbl) {
		long bits = Double.doubleToLongBits(dbl);
		return hashCode(bits);
	}

	public static int hashCode(float flt) {
		return Float.floatToIntBits(flt);
	}

	public static int hashCode(long lng) {
		return (int) (lng ^ lng >>> 32);
	}

	public static String identityToString(Object obj) {
		if (obj == null) {
			return "";
		}
		return obj.getClass().getName() + "@" + getIdentityHexString(obj);
	}

	public static String getIdentityHexString(Object obj) {
		return Integer.toHexString(System.identityHashCode(obj));
	}

	public static String getDisplayString(Object obj) {
		if (obj == null) {
			return "";
		}
		return nullSafeToString(obj);
	}

	public static String nullSafeClassName(Object obj) {
		return ((obj != null) ? obj.getClass().getName() : "null");
	}

	public static String nullSafeToString(Object obj) {
		if (obj == null) {
			return "null";
		}
		if (obj instanceof String) {
			return ((String) obj);
		}
		if (obj instanceof Object[]) {
			return nullSafeToString((Object[]) obj);
		}
		if (obj instanceof boolean[]) {
			return nullSafeToString((boolean[]) obj);
		}
		if (obj instanceof byte[]) {
			return nullSafeToString((byte[]) obj);
		}
		if (obj instanceof char[]) {
			return nullSafeToString((char[]) obj);
		}
		if (obj instanceof double[]) {
			return nullSafeToString((double[]) obj);
		}
		if (obj instanceof float[]) {
			return nullSafeToString((float[]) obj);
		}
		if (obj instanceof int[]) {
			return nullSafeToString((int[]) obj);
		}
		if (obj instanceof long[]) {
			return nullSafeToString((long[]) obj);
		}
		if (obj instanceof short[]) {
			return nullSafeToString((short[]) obj);
		}
		String str = obj.toString();
		return ((str != null) ? str : "");
	}

	public static String nullSafeToString(Object[] array) {
		if (array == null) {
			return "null";
		}
		int length = array.length;
		if (length == 0) {
			return "{}";
		}
		StringBuilder sb = new StringBuilder();
		for (int i = 0; i < length; ++i) {
			if (i == 0) {
				sb.append("{");
			} else {
				sb.append(", ");
			}
			sb.append(String.valueOf(array[i]));
		}
		sb.append("}");
		return sb.toString();
	}

	public static String nullSafeToString(boolean[] array) {
		if (array == null) {
			return "null";
		}
		int length = array.length;
		if (length == 0) {
			return "{}";
		}
		StringBuilder sb = new StringBuilder();
		for (int i = 0; i < length; ++i) {
			if (i == 0) {
				sb.append("{");
			} else {
				sb.append(", ");
			}

			sb.append(array[i]);
		}
		sb.append("}");
		return sb.toString();
	}

	public static String nullSafeToString(byte[] array) {
		if (array == null) {
			return "null";
		}
		int length = array.length;
		if (length == 0) {
			return "{}";
		}
		StringBuilder sb = new StringBuilder();
		for (int i = 0; i < length; ++i) {
			if (i == 0) {
				sb.append("{");
			} else {
				sb.append(", ");
			}
			sb.append(array[i]);
		}
		sb.append("}");
		return sb.toString();
	}

	public static String nullSafeToString(char[] array) {
		if (array == null) {
			return "null";
		}
		int length = array.length;
		if (length == 0) {
			return "{}";
		}
		StringBuilder sb = new StringBuilder();
		for (int i = 0; i < length; ++i) {
			if (i == 0) {
				sb.append("{");
			} else {
				sb.append(", ");
			}
			sb.append("'").append(array[i]).append("'");
		}
		sb.append("}");
		return sb.toString();
	}

	public static String nullSafeToString(double[] array) {
		if (array == null) {
			return "null";
		}
		int length = array.length;
		if (length == 0) {
			return "{}";
		}
		StringBuilder sb = new StringBuilder();
		for (int i = 0; i < length; ++i) {
			if (i == 0) {
				sb.append("{");
			} else {
				sb.append(", ");
			}

			sb.append(array[i]);
		}
		sb.append("}");
		return sb.toString();
	}

	public static String nullSafeToString(float[] array) {
		if (array == null) {
			return "null";
		}
		int length = array.length;
		if (length == 0) {
			return "{}";
		}
		StringBuilder sb = new StringBuilder();
		for (int i = 0; i < length; ++i) {
			if (i == 0) {
				sb.append("{");
			} else {
				sb.append(", ");
			}

			sb.append(array[i]);
		}
		sb.append("}");
		return sb.toString();
	}

	public static String nullSafeToString(int[] array) {
		if (array == null) {
			return "null";
		}
		int length = array.length;
		if (length == 0) {
			return "{}";
		}
		StringBuilder sb = new StringBuilder();
		for (int i = 0; i < length; ++i) {
			if (i == 0) {
				sb.append("{");
			} else {
				sb.append(", ");
			}
			sb.append(array[i]);
		}
		sb.append("}");
		return sb.toString();
	}

	public static String nullSafeToString(long[] array) {
		if (array == null) {
			return "null";
		}
		int length = array.length;
		if (length == 0) {
			return "{}";
		}
		StringBuilder sb = new StringBuilder();
		for (int i = 0; i < length; ++i) {
			if (i == 0) {
				sb.append("{");
			} else {
				sb.append(", ");
			}
			sb.append(array[i]);
		}
		sb.append("}");
		return sb.toString();
	}

	public static String nullSafeToString(short[] array) {
		if (array == null) {
			return "null";
		}
		int length = array.length;
		if (length == 0) {
			return "{}";
		}
		StringBuilder sb = new StringBuilder();
		for (int i = 0; i < length; ++i) {
			if (i == 0) {
				sb.append("{");
			} else {
				sb.append(", ");
			}
			sb.append(array[i]);
		}
		sb.append("}");
		return sb.toString();
	}
}